C# Byte Sized: Variables

CSharpByteSizedVariables.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.1</TargetFramework>
  </PropertyGroup>

  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
  </PropertyGroup>

</Project>

Program.cs

using System;
using System.Runtime.InteropServices;

namespace CSharpByteSizedVariables
{
    class Program
    {
        static void Main(string[] args)
        {
            /* 
             * Demonstrate program using different data types
             * to display different outputs for the same 'in-memory' value
             */
            byte b = 33;
            char c = (char)33;
            Console.WriteLine(b.ToString());
            Console.WriteLine(c.ToString());
            Console.WriteLine();

            /*
             * Shows different memory allocation sizes for different data types
             */
            short s = short.MinValue;
            int i = int.MinValue;
            long l = long.MinValue;
            double d = double.MinValue;

            Console.WriteLine(Marshal.SizeOf(c));
            Console.WriteLine(Marshal.SizeOf(b));
            Console.WriteLine(Marshal.SizeOf(s));
            Console.WriteLine(Marshal.SizeOf(i));
            Console.WriteLine(Marshal.SizeOf(l));
            Console.WriteLine(Marshal.SizeOf(d));
            Console.WriteLine();

            UnsafeCodeExamples();
        }

        /*
         * Method marked as unsafe and 'unsafe' code needs to be allowed in csproj
         * 'unsafe' is it is accessing 'unmanaged memory'
         */
        static unsafe void UnsafeCodeExamples()
        {
            int i2;
            int* p2 = &i2;
            IntPtr ip2 = new IntPtr(p2);
            Console.WriteLine(Marshal.ReadInt32(ip2));

            int i3 = int.MaxValue;
            int* p3 = &i3;
            IntPtr ip3 = new IntPtr(p3);
            Console.WriteLine(Marshal.ReadInt32(ip3));
        }
    }
}

Program.cs(ILSpy generated)

// Program
using System;
using System.Runtime.InteropServices;

internal class Program
{
	private static void Main(string[] args)
	{
		byte structure = 33;
		char structure2 = '!';
		Console.WriteLine(structure.ToString());
		Console.WriteLine(structure2.ToString());
		Console.WriteLine();
		short structure3 = short.MinValue;
		int structure4 = -2147483648;
		long structure5 = -9223372036854775808L;
		double structure6 = -1.7976931348623157E+308;
		Console.WriteLine(Marshal.SizeOf(structure2));
		Console.WriteLine(Marshal.SizeOf(structure));
		Console.WriteLine(Marshal.SizeOf(structure3));
		Console.WriteLine(Marshal.SizeOf(structure4));
		Console.WriteLine(Marshal.SizeOf(structure5));
		Console.WriteLine(Marshal.SizeOf(structure6));
		Console.WriteLine();
		UnsafeCodeExamples();
	}

	private unsafe static void UnsafeCodeExamples()
	{
		int num = default(int);
		int* value = #
		IntPtr ptr = new IntPtr(value);
		Console.WriteLine(Marshal.ReadInt32(ptr));
		int num2 = 2147483647;
		int* value2 = &num2;
		IntPtr ptr2 = new IntPtr(value2);
		Console.WriteLine(Marshal.ReadInt32(ptr2));
	}
}